@article{DMTCS_2019_21_2_a5,
     author = {Blanco, Sa\'ul A. and Buehrle, Charles and Patidar, Akshay},
     title = {On the number of pancake stacks requiring four flips to be sorted},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2019},
     doi = {10.23638/DMTCS-21-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.23638/DMTCS-21-2-5/}
}